Will a pressure reducing valve near the main stop tap get rid of water hammer Becucause i don't know which pipe is making the banging noise every few minutes.
Do you live in a house or flat?
What sort of CH and HW system do you have? You need to describe your set up in more detail.
It could be any number of things...
PRV discharge on a sealed system.
Toilet inlet valves.
Ball cock valves.
Neighbours system.
Pumps.
NRVs.
Mixer valves.
Etc...
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